关键词: 垃圾焚烧, 循环水泵, 运行效率, 优化设计

Abstract: The circulating water pump is a core power-consuming device in the cold-end system of waste-to-energy incineration plants, while its operational efficiency and system compatibility directly impact the plant’s electricity consumption rate, unit vacuum level, and overall economic performance. Taking the waste-to-energy incineration plant (600 t/d grate furnace + 15 MW unit) in Yuanyang county, Xinxiang city, Henan province as a case study, this paper addresses issues such as cavitation, excessive vibration, high noise, and inefficiency in the actual operation of circulating water pumps caused by severe deviations from design operating conditions (particularly during single-pump operation, the reduces of pipeline system resistance results in actual flow rates far exceeding the design-rated flow, leading to inefficient pump operation). Comprehensive energy-saving measures have been implemented, including replacing circulating water pumps with models matching flow and head requirements during single-pump operation, and adopting a combination of high-power frequency pumps and variable-frequency small pumps during dual-pump operation. After optimization, the circulating water system can save 5.25×105 kWh of electricity throughout the year, equivalent to an annual carbon emission reduction (calculated as CO2) of 299.41 t, with an overall energy-saving rate of 39%.

Key words: waste incineration, circulating water pump, operational efficiency, optimal design